The Prepar3D® SDK is available as a free download to anyone looking to get into developing add-ons or content for Prepar3D®.

The Prepar3D SDK 1.4.4747.0 (Prepar3D SDK Release 1.4) is directly compatible with Prepar3D 1.4.4747.0 (Prepar3D Release 1.4). The SimConnect.lib and LockheedMartin.Prepar3D.SimConnect.dll provided in the SDK can not be used to connect to FSX, ESP or any previous release of Prepar3D.

The SimConnect server in the Prepar3D application is backwards compatible with the SimConnect.dll’s of FSX and ESP and the ESP SimConnect server is backwards compatible with the SimConnect.dll’s of FSX. This means that if you are trying to develop an add on that will work with FSX, ESP, and Prepar3D, you will need to use a version of the SimConnect SDK that works with FSX.

Click here to open the online SDK documentation (1.4.4747.0).

Click here to download the Prepar3D SDK with tools and the SDK Learning Center documentation.

The SDK documentation is now accessible via the new SDK Learning Center application. This application is installed in your Start Menu when you install the SDK. It can also be found in the SDK installation directory in \LC\LearningCenter.exe.